Article ID Journal Published Year Pages File Type
5424897 Surface Science 2008 8 Pages PDF
Abstract

Hydronium segregates to the surface of H2O (D2O) ice films grown on Pt(1 1 1) above 151 K (158 K). This is observed via the voltage that develops across the films, utilizing work function measurements. The dependence of this voltage on the film's thickness is explained by a simple equilibrium model: as the film grows, most of the surface ions migrate so as to remain at the ice-vacuum interface, while a fixed percentage (∼0.05%) take the thermodynamically-unfavored route, to become incorporated into the growing bulk ice. This model implies a ΔG of about +0.1 eV for the movement of ions from the ice surface into the bulk ice.

Related Topics
Physical Sciences and Engineering Chemistry Physical and Theoretical Chemistry
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